Restructure sandbox code to reduce dependencies pulled in by intercept code.

sandbox/win/src/nt_internals.h

Index: sandbox/win/src/nt_internals.h
diff --git a/sandbox/win/src/nt_internals.h b/sandbox/win/src/nt_internals.h
index 1423be4937db7a0214a4d113340a084655743665..02e01400338f8c3bf883e97b0be0bdd84c83aeb5 100644
--- a/sandbox/win/src/nt_internals.h
+++ b/sandbox/win/src/nt_internals.h
@@ -601,6 +601,11 @@ typedef size_t  (__cdecl *strlenFunction)(
 typedef size_t (__cdecl *wcslenFunction)(
   IN const wchar_t* _Str);
 
+typedef void* (__cdecl *memcpyFunction)(
+  IN void *dest,
+  IN const void *src,
+  IN size_t count);
+
 typedef NTSTATUS (WINAPI *RtlAnsiStringToUnicodeStringFunction)(
   IN OUT PUNICODE_STRING  DestinationString,
   IN PANSI_STRING  SourceString,